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Allowance for Loan Losses - Loan Status and Aging of Past Due TDR Loans (Details) - Troubled Debt Restructured Loans - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDR loans in in-school/grace/deferment	$ 1,761	$ 2,915
TDR loans in forbearance	56,008	18,620
TDR loans in repayment and percentage of each status:
Loans current	116,609	34,554
Total TDR loans in repayment	129,374	37,867
Total TDR loans, gross	$ 187,143	$ 59,402
Loans current, in percentage	90.10%	91.20%
Total TDR loans in repayment, in percentage	100.00%	100.00%
Loans delinquent 31-60 days
TDR loans in repayment and percentage of each status:
Loans delinquent	$ 7,561	$ 1,953
Loans delinquent, in percentage	5.80%	5.20%
Loans delinquent 61-90 days
TDR loans in repayment and percentage of each status:
Loans delinquent	$ 4,092	$ 983
Loans delinquent, in percentage	3.20%	2.60%
Loans delinquent greater than 90 days
TDR loans in repayment and percentage of each status:
Loans delinquent	$ 1,112	$ 377
Loans delinquent, in percentage	0.90%	1.00%

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-Topic 310



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